نتایج جستجو برای: elastic stability

تعداد نتایج: 367366  

Journal: :Bulletin of the Military University of Technology 2015

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2009
P M Marcus S L Qiu

The elastic behavior and stability of elemental crystals are studied in the neighborhood of a stable equilibrium state, also called a phase, at finite pressure p. It is shown that two kinds of elastic constants are needed to describe elasticity under pressure. One set, designated as c(ij),i,j = 1-6, determines stability or lack of it; another set, designated as c(ij)(p), describes the linear re...

A. Bodaghi, A. R. Izadbakhsh

This paper is concerned with the problem of designing a robust adaptive controller for flexible joint robots (FJR). Under the assumption of weak joint elasticity, FJR is firstly modeled and converted into singular perturbation form. The control law consists of a FAT-based adaptive control strategy and a simple correction term. The first term of the controller is used to stability of the slow dy...

A. Mamandi, M.H. Kargarnovin

This paper studies the nonlinear vibration analysis of a simply supported Euler-Bernoulli beam resting on a nonlinear elastic foundation under compressive axial load using nonlinear normal modes concept in the case of three-to-one (3:1) internal resonance. The beam’s governing nonlinear PDE of motion and also its boundary conditions are derived and then solved using the method of Multiple Time ...

1999
Chen Zeng P. L. Leath Daniel S. Fisher

The stability to dislocations of the elastic phase, or “Bragg glass,” of a randomly pinned elastic medium in two dimensions is studied using the minimum-cost-flow algorithm for a disordered fully packed loop model. The elastic phase is found to be unstable to dislocations due to the quenched disorder. The energetics of dislocations are discussed within the framework of renormalization group pre...

2001
Jonathan P. Rothstein Gareth H. McKinley

Previous experimental measurements and linear stability analyses of curvilinear shearing flows of viscoelastic fluids have shown that the combination of streamwise curvature and elastic normal stresses can lead to flow destabilization. Torsional shear flows of highly elastic fluids with closed streamlines can also accumulate heat from viscous dissipation resulting in nonuniformity in the temper...

Journal: :international journal of electrical and electronics engineering 0
m. a. khosravi hamid d. taghirad professor and dean of faculty of electrical engineering, k.n. toosi university of technology

in this paper robust pid control of fully-constrained cable driven parallel manipulators with elastic cables is studied in detail. in dynamic analysis, it is assumed that the dominant dynamics of cable can be approximated by linear axial spring. to develop the idea of control for cable robots with elastic cables, a robust pid control for cable driven robots with ideal rigid cables is firstly de...

Journal: :جنگل و فرآورده های چوب 0
علیرضا سوخته سرائی دانشگاه تهران سحاب حجازی دانشگاه تهران- دکترا لعیا جمالی راد دانشگاه گنبد کاووس محمد احمدی دانشگاه تهران سید بهنام حسینی دانشگاه تهران

in this study , the physical and mechanical properties of polypropylene composites reinforced with bagasse alkaline-sulfite-anthraquinone, soda-anthraqouinone, monoethanolamine-anthraquinone chemical pulps and mechanical pulp (cmp) known as pulp-plastic compostes (ppc) were investigated and the results were compared among ppcs and with polypropylene composites reinforced with bagasse flour know...

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